CN101013572A - Optical disk controller and optical disk device - Google Patents
Optical disk controller and optical disk device Download PDFInfo
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- CN101013572A CN101013572A CNA2007100020359A CN200710002035A CN101013572A CN 101013572 A CN101013572 A CN 101013572A CN A2007100020359 A CNA2007100020359 A CN A2007100020359A CN 200710002035 A CN200710002035 A CN 200710002035A CN 101013572 A CN101013572 A CN 101013572A
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- disc apparatus
- light beam
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0945—Methods for initialising servos, start-up sequences
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
- G11B19/20—Driving; Starting; Stopping; Control thereof
- G11B19/26—Speed-changing arrangements; Reversing arrangements; Drive-transfer means therefor
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
- G11B19/20—Driving; Starting; Stopping; Control thereof
- G11B19/28—Speed controlling, regulating, or indicating
Abstract
An optical disk controller and an optical disk device are provided to enable a controller for executing an operation in high rate, thereby reducing power consumption.The optical disc controller of the present invention servo-controls an optical disc device which comprises a disc motor rotating an optical disc and an optical head emitting a light beam for recording data on the optical disc and/or reproducing data from the optical disc. The optical disc controller comprises: a variable clock output section for outputting a plurality of clock signals of different frequencies, and a control section which receives from the optical head a signal indicating a deviation from a predetermined target value to servo-control the light beam of the optical disc device and performs an operation according to the signal indicating the deviation so as to obtain and output a signal indicating a control amount.
Description
The application is that application number is " 200310102552.5 ", and the applying date is on October 23rd, 2003, and denomination of invention is divided an application for the application of " optical disc controller and optical disc apparatus ".
Technical field
The present invention relates to optical disc apparatus, relate in particular to and in optical disc apparatus, carry out servo-controlled optical disc controller.
Background technology
Use Fig. 8 and Fig. 9 that existing technology is described.Fig. 8 is the block scheme of the existing optical disc apparatus 400 of expression, and represents so that constituting of drive system is main.Fig. 9 is the control figure regularly of each component part in the drive system of expression optical disc apparatus 400.Optical disc apparatus 400 possesses table motor 402, shaven head 403 and digital signal processor (hereinafter to be referred as DSP) 412.
Table motor mounting dish 401 also makes its rotation.The light source (not shown) that shaven head 403 comprises illumination beam, be used to make beam convergence condenser lens 405, drive driver 407 and the detecting device 404 and the analog operating unit 408 of condenser lens 405.Shaven head 403 penetrates the light beam of assembling at the information recording surface of dish 401, and the photodetector 404 that is installed in the shaven head 403 detects the reflected light or the transmitted light of light beam, and is transformed into electric signal.Photodetector 404 is divided into regional 404a, 404c and regional 404b, 404d as shown in Figure 8 so that corresponding with the tangential direction of (light) track, in addition, be divided into regional 404a, 404b with regional 404c, 404d so that corresponding to the direction vertical with track.In other words, the surveyed area of photodetector is divided into 4.
Being installed in the condenser lens 405 of shaven head in 403 drives on as the radial direction with the focus direction of the vertical direction of the information recording surface of CD 401 and CD 401 by driver 407.Shaven head 403 all can move at the radial direction of CD 401 by horizontal motor 406.
DSP412 moves according to the output clock of clock follower 423, and carries out following calculation process according to the output of the Abort Timer 422 shown in Fig. 9 (A).
At first, DSP412 is since the computing (representing with DM among the figure) of moment D1 table motor control.Table motor 402 output and the corresponding FG signals of swing circle, and with the cycle count of period counter to this FG signal.Instruction according to system controller 424, DSP412 is to the output of period counter 421 and the difference of table motor rolling target RAM, implement the digital filter computing according to the table motor filter coefficient among the RAM that is set at DSP412 (not shown), and operation result is exported to transducer 416 with the timing shown in Fig. 9 (M) as the control signal that is used for driving-disc motor 402.Pwm converter 416 receives control signal, carries out pulse amplitude modulation, and to driving circuit 420 outputs.The signal that driving circuit 420 will receive carries out power amplification, and to horizontal motor 402.Therefore, the revolution of table motor 402 is controlled to become the value of regulation.
At this moment, parallel with above-mentioned processing, A/D transducer 411 is delivered to sample-and-hold circuit 409 with the S/H signal like that shown in Fig. 9 (B), at moment S1 to the maintenance of taking a sample of FE+ signal and FE-signal.In addition, A/D transducer 411 like that, transmits control signal so that export the FE+ signal at moment S1 selector switch 410 shown in Fig. 9 (C).A/D transducer 411 carries out the A/D conversion like that shown in Fig. 9 (D), like that, obtain FE+ signal transformation is become the A/D transformed value (EF+ transformed value) of digital signal shown in Fig. 9 (E).In addition, A/D transducer 411 is delivered to selector switch 410 with control signal so that selector switch 410 output FE-signals at S1.A/D transducer 411 carries out the A/D conversion like that shown in Fig. 9 (D), obtain the FE-signal transformation shown in Fig. 9 (F) is become the A/D transformed value (FE-transformed value) of digital signal.
DSP412 is such computing (among the figure, representing with Fc) since moment D2 focal point control shown in Fig. 9 (I).The TE+ signal (TE+ transformed value) that the DSP412 computing changes to digital value in A/D transducer 411 and the difference of TE-signal (TE-transformed value) obtain the trail-and-error signal.Instruction according to system controller 424, DSP412 implements the digital filter computing to the trail-and-error signal according to the tracking filter coefficient among the RAM that is set at DSP412 (not shown), and operation result is exported to D/A transducer 413 with the timing shown in Fig. 9 (J) as the control signal of the tracking coil that is used to drive driver 407.D/A transducer 413 becomes the analogue value with the output transform of DSP412, to driving circuit 417 outputs.Driving electric 417 is carried out power amplification with the control signal of simulation, and arrives the tracking coil of driver 407.Therefore, the convergent point of light beam is controlled to make its position on the information recording surface of CD 401.
In addition, the output of photodetector 404 is imported into analog operating unit 408, analog operating unit 408 output TE+ signal and TE-signals.By getting the difference of this TE+ signal and TE-signal, can access the trail-and-error signal of the position deviation of expression focus of light beam and track.For example obtaining the occasion of trail-and-error signal with the method for recommending, the TE+ signal is the additive signal of the signal that obtains from photodetector 404a and 404c, and the TE-signal is the additive signal of the signal that obtains from photodetector 404b and 404d.
A/D transducer 411 is delivered to sample-and-hold circuit 409 with control signal, so as at moment S3 to the maintenance of taking a sample of TE+ signal and TE-signal.In addition, A/D transducer 411 is delivered to selector switch 410 with control signal, so that at moment S3 output TE+ signal.Like that, A/D transducer 411 carries out the A/D conversion, obtains the A/D transformed value (TE+ transformed value) as the digital signal of TE+ signal shown in Fig. 9 (G).In addition, A/D transducer 411 is delivered to selector switch 410 with control signal, so that at moment S4 output TE-signal.Like that, A/D transducer 411 carries out the A/D conversion, obtains the A/D transformed value (TE-transformed value) as the digital signal of TE-signal shown in Fig. 9 (H).
DSP412 is since the computing (among the figure, representing with Tk) of moment D3 tracking Control.The DSP412 computing in the TE+ signal (TE+ transformed value) from A/D transducer 411 to the digital value conversion and the difference of TE-signal (TE-transformed value) and obtain the trail-and-error signal.Instruction according to system controller 424, DSP412 to the trail-and-error signal according to the tracking filter coefficient operand character filter computing among the RAM that is set at DSP412 (not shown), and with operation result as the control signal of the tracking coil that is used to drive driver 407 with the timing shown in Fig. 9 (K) to 414 outputs of D/A transducer.D/A transducer 414 becomes the analogue value with the output transform of DSP412, to driving circuit 418 outputs.Driving circuit 418 carries out power amplification with the control signal of simulation, and arrives the tracking coil of driver 407.The convergent point of light beam is controlled to the position on the orbit centre of CD 401.
In addition, DSP412 begins the laterally computing (the figure, representing with TRS) of control from D4.Instruction according to system controller 424, DSP412 is to the trail-and-error signal, according to the transversal filter coefficient implementation data wave filter computing among the RAM that is set at DSP412 (not shown), and with operation result as the control signal that is used to drive horizontal motor 406, with the timing shown in Fig. 9 (L) to pwm converter 415 outputs.Pwm converter 415 receives control signal, carries out pulse amplitude modulation, and to driving circuit 419 outputs.The signal that driving circuit 419 will receive carries out power amplification, and to horizontal motor 406.Therefore, the position Be Controlled of shaven head 403, the convergent point position that makes light beam is on the orbit centre of dish 401.
The moment D5 that DSP412 finishes from the computing (TRS) of horizontal control waits for action to the output time D6 of next Abort Timer 422.
In existing optical disc apparatus 400, in the doubly fast occasion of change record, regeneration, system controller 424 rewrites table motor rolling target RAM, table motor filter coefficient RAM, focus filter coefficients R AM and the tracking filter coefficients R AM (for example patent documentation 1) of DSP412.Therefore, under the state of the filter characteristic of the number of revolutions that makes table motor and focus servo and tracking servo change, can write down, regenerate.
In addition, whole servocontrol is in the occasion of halted state, and system controller 424 is delivered to clock follower 423 with signal, stops to supply with to the clock of DSP412.DSP412 transfers to sleep state, seeks to reduce power consumption.
In addition, when the debugging of the exploitation of optical disc apparatus 400, or when the repairing of optical disc apparatus, in order to observe focus servo control or tracking servo control whether correctly carrying out work, according to the instruction of system controller 424, DSP412 is to serial port 425 output focus error signal or trail-and-error signals.The output of serial port 425 is carried out serial-to-parallel conversion in the anchor clamps 426 of the optical disc apparatus special use that is connected to optical disc apparatus 400, carried out the D/A conversion by the data of parallel transformation in anchor clamps 426, and is output as simulating signal.By with the simulating signal of oscillograph 427 observations, can observe focus error signal and trail-and-error signal from anchor clamps 426 outputs.
[patent documentation 1] spy opens flat 11-185259 communique
Summary of the invention
In recent years, along with the raising of the arithmetic speed of computing machine, also sought and enough high power speed to write down, to regenerate as the optical disc apparatus of the peripherals of computing machine.In addition, in the portable electric appts that possesses optical disc apparatus such as notebook and PDA, game machine, portable phonograph, in order to prolong the duration of electric battery, and seek to reduce power consumption.
In addition, when exploitation and the repairing behind product export, also seek efficient activity.
But existing optical disc apparatus is not to resemble the low consumption electric power that fully satisfies such requirement, in addition, if do not have special-purpose anchor clamps just can not carry out the observation of control signal during the repairing behind when exploitation and product export.
The present invention can solve such problem, and writes down, regenerates with high power speed, and its purpose is to provide little optical disc controller of power consumption and optical disc apparatus.Can observe the optical disc controller and the optical disc apparatus of control signal when in addition, the object of the present invention is to provide repairing behind when exploitation and product export easily.
Optical disc controller of the present invention is exactly the table motor that is used to make the CD rotation to possessing, and penetrate be used for carrying out the CD record data and/or from CD the optical disc apparatus of the shaven head of the light beam of playback of data carry out servocontrol, it possesses the V-CLK output of the different a plurality of clock signals of output frequency, and for the light beam of the described optical disc apparatus of servocontrol, by receiving the signal of expression from the departure of the desired value of regulation from described shaven head, signal according to the described departure of expression carries out computing, obtains the signal of expression controlled quentity controlled variable and the control section of output.Writing down and/or the record speed multiplay of the occasion of reproduction operation and/or regeneration speed doubly according to described optical disc apparatus, described V-CLK output changes the frequency of described clock signal, the row operation of going forward side by side synchronously of the clock signal of described control section and described V-CLK output.
In a kind of desirable example, described computing is carried out by the wave filter that the signal process that makes the described departure of expression has the characteristic of regulation, and the characteristic of described wave filter is doubly fast and inequality according to described record speed multiplay and/or regeneration.
In a kind of desirable example, the characteristic of described wave filter is determined by the frequency of filter coefficient and described clock signal, no matter how described filter coefficient is all identical for described record speed multiplay and/or regeneration times speed.
Optical disc apparatus of the present invention possesses: light beam irradiates at the CD with the track that is used for record data, will be transformed into the conversion fraction of electric signal from the reflected light of described CD reflection or the transmitted light that passes described CD; The focus actuator that the focus of described light beam is moved in the direction vertical with described optical disc data face; The tracking driver that described light beam is moved to the radial direction of described CD; Carry out computing according to described electric signal, described light beam keeps the converged state of regulation to control focus actuator like that at described data surface, generates to be used to control described tracking driver so that make the control section of described light-beam position in the control signal at the center of described track; And the V-CLK output of the different a plurality of clock signals of output frequency, described conversion fraction according to write down and/or the record speed multiplay of the occasion of the action of regenerating and or regeneration speed doubly, described V-CLK output changes the frequency of described clock signal, and described control section and described variable clock signal carry out computing synchronously.
In a kind of desirable example, optical disc apparatus also possesses the described electric signal of reception, export to described control section after being transformed into digital signal, in addition, receive control signal from described control section, be transformed into after the simulating signal to described focus actuator and follow the tracks of the output of driver output, the Action clock of described importation no matter described record speed multiplay and/or regeneration doubly speed how all to be certain.
In a kind of desirable example, described control section generates described control signal by the wave filter that makes described electric signal process have the characteristic of regulation, and the characteristic of described wave filter is doubly fast and different according to described record speed multiplay and/or regeneration.
In a kind of desirable example, the characteristic of described wave filter is determined by the frequency of filter coefficient and clock signal, no matter how described wave filter is all identical for described record speed multiplay and/or regeneration times speed.
In addition, optical disc controller of the present invention is used to carry out at the CD identifying recording layer and/or from the optical disc apparatus of the shaven head of the light beam of optical disc reproducing data, the described shaven head of servocontrol, described table motor and light beam possessing the table motor that is used for making the CD rotation and penetrate.Optical disc controller possesses the interrupt signal generator that produces look-at-me every official hour, and by receiving from the departure of desired value from the described shaven head of described optical disc apparatus and described table motor or representing the electric signal of current state, and carry out computing according to described electric signal, obtain the control signal of expression controlled quentity controlled variable and the control section of output, described control section divides the described look-at-me of reception to carry out described computing from described look-at-me generating unit at every turn, and after having received described look-at-me, at least stop the action of stipulated time during before receiving next look-at-me, become sleep state.
In a kind of desirable example, the described look-at-me of the each reception of described control section is carried out described computing, and after described computing finishes, quits work before receiving next look-at-me, becomes sleep state.
In a kind of desirable example, described computing comprise the table motor control that is used to control described table motor calculation process, carry out the calculation process of described beams focusing control and carry out the computing of tracking Control of described light beam and the calculation process of carrying out the horizontal control of described shaven head, described control section stops action at least to calculation process separately during 1 in these calculation process, become sleep state.
In a kind of desirable example, optical disc controller possesses the described electric signal of reception, and be transformed into digital signal and export to described control section, in addition, receive control signal from described control section, be transformed into after the simulating signal input to described shaven head and the output of described table motor, described control section is by receiving electric signal to separately described calculation process, the output control signal, carry out 1 processing of described calculation process, with described control signal after the output of described input, described control section is taked sleep state, described input receives the electric signal that is used for calculation process next time, and after the conversion to digital signal finished, described control section recovered from sleep state.
In a kind of desirable example, optical disc controller also possesses the described electric signal of reception, and export to described control section after being transformed into digital signal, in addition, receive control signal from described control section, be transformed into after the simulating signal input to described shaven head and the output of described table motor, described control section is by receiving electric signal to separately described calculation process, the output control signal, carry out 1 processing of described calculation process, with described control signal after the output of described input, described control section is taked the sleep state of official hour, recovers from sleep state through behind the official hour.
In a kind of desirable example, at least a portion of described input is also moved when described control section is in sleep state.
In addition, optical disc apparatus of the present invention possesses: comprise light beam irradiates at the CD with (light) track that is used for record data, to become the conversion fraction of electric signal from the reflected light of described CD reflection or the transmitted light that sees through described CD, the focus actuator that the focus of described light beam is moved, and the shaven head that makes the tracking driver that described light beam moves to the radial direction of described CD; Be used to table motor that CD is revolved; Produce the interrupt signal generator of look-at-me every official hour; And by receiving from the departure of desired value from described shaven head and described table motor or representing the electric signal of current state, and carry out computing according to described electric signal, obtain the control signal of expression controlled quentity controlled variable and the control section of output, described control section divides the described look-at-me of reception just to carry out described computing from the look-at-me generating unit at every turn, and after having received described look-at-me, at least stop the action of stipulated time during before receiving next look-at-me, become sleep state.
In a kind of desirable example, the described look-at-me of the each reception of described control section is carried out described computing, and after described computing finishes, stops action before the look-at-me that receives next time, becomes sleep state.
In a kind of desirable example, described computing comprise the table motor control that is used to control described table motor calculation process, carry out the calculation process of described beams focusing control and carry out the computing of tracking Control of described light beam and the calculation process of carrying out the horizontal control of described shaven head, described control section stops action at least to calculation process separately during 1 of these calculation process, become sleep state.
In a kind of desirable example, optical disc apparatus also possesses the described electric signal of reception, and export to described control section after being transformed into electric signal, in addition, receive control signal from described control section, be transformed into after the simulating signal input to described shaven head and the output of described table motor, described control section is by to separately described calculation process, receive electric signal, the output control signal, carry out 1 processing of described calculation process, with described control signal after the output of described input, described control section is taked sleep state, described input receives the electric signal that is used for calculation process next time, and after the conversion to digital signal finished, described control section recovered from sleep state.
In a kind of desirable example, optical disc apparatus also possesses the described electric signal of reception, and export to described control section after being transformed into electric signal, in addition, receive control signal from described control section, be transformed into after the simulating signal input to described shaven head and the output of described table motor, described control section is by to separately described calculation process, receive electric signal, the output control signal is carried out 1 processing of described calculation process, with described control signal after the output of described input, described control section is taked the sleep state of stipulated time, through behind the official hour, recovers from sleep state.
In a kind of desirable example, when described control section was in sleep state, at least a portion of described input was also moved.
In addition, optical disc controller of the present invention is to possessing the table motor that is used to make the CD rotation, and penetrates and be used to carry out carry out servocontrol at the CD identifying recording layer and/or from the optical disc apparatus of the shaven head of the light beam of optical disc reproducing data.Optical disc controller possesses: by receive the electric signal of expression from the departure of desired value or current state from the described shaven head of described optical disc apparatus and described table motor, carry out computing according to described electric signal, obtain the control signal of expression controlled quentity controlled variable and the control section of output, and as having the input of monitor terminal, receive described electric signal from described controller, and be transformed into simulating signal, perhaps, receive control signal and be transformed into simulating signal from described control section, and with conversion signal from the input of described monitor terminal to outside output.
In a kind of desirable example, described electric signal is focus error signal or trail-and-error signal.
In addition, optical disc apparatus of the present invention is to possessing: the table motor that is used to make the CD rotation; Ejaculation is used to carry out at the CD identifying recording layer and/or from the shaven head of the light beam of optical disc reproducing data; By receive the electric signal of expression from the described shaven head of described optical disc apparatus and described table motor from the departure of desired value or current state, carry out computing according to described electric signal, obtain the control signal of expression controlled quentity controlled variable and the control section of output; And as having the input of monitor terminal, receive described electric signal from described controller, and be transformed into simulating signal, perhaps, receive control signal and be transformed into simulating signal from described control section, and with conversion signal from the input of described monitor terminal to outside output.
In a kind of desirable example, described electric signal is focus error signal or trail-and-error signal.
If according to the present invention, because according to record, the regeneration times servo-controlled work clock of speed change, Yi Bian therefore can suitably control optical disc apparatus, Yi Bian seek the reduction of power consumption.
In addition, if according to the present invention, the control section of servo-controlled computing that is used for shaven head and table motor during not carrying out calculation process, is taked sleep state 1 sample period.Therefore, can reduce the power consumption of control section.
In addition, the Servocontrol device of optical disc apparatus of the present invention does not need to be used for directly just can observation signal with the unit clamp of simulating signal output focus error signal or tracking signal from the D/A transducer, and energy measurement is when exploitation and the efficient in when repairing.
Description of drawings
Fig. 1 is the block scheme of the 1st example of expression optical disc apparatus of the present invention.
Fig. 2 is the control figure regularly that is illustrated among the DSP of optical disc apparatus shown in Figure 1.
Fig. 3 (a) and (b) be the curve map of an example that is illustrated in the characteristic of the digital filter that uses in the DSP that CD shown in Figure 1 changes.
Fig. 4 is the block scheme of the 2nd example of expression optical disc apparatus of the present invention.
Fig. 5 is the control figure regularly that is illustrated among the DSP of optical disc apparatus shown in Figure 4.
Fig. 6 is the control figure regularly that is illustrated among the DSP of optical disc apparatus shown in Figure 1 other.
Fig. 7 is the block scheme of the 3rd example of expression optical disc apparatus of the present invention.
Fig. 8 is the block scheme of the existing optical disc apparatus of expression.
Fig. 9 is the control figure regularly among the DSP of the existing optical disc apparatus of expression.
Embodiment
(the 1st example)
In optical disc apparatus, in order to carry out writing task, or carry out reproduction operation with high power speed with high power speed, be necessary that work clock with high frequency makes and be the condenser lens of servocontrol shaven head and table motor, the laterally DSP action of motor etc.Doing in the corresponding optical disc apparatus with existing high power quick-action, because the work clock of DSP is fixed, even therefore with the occasion of low power speed work, DSP also moves with the work clock of high frequency.Therefore, in the occasion with the work of low power speed, DSP there is no need to carry out high speed motion, and does not need big power consumption.In this example, write down or the power consumption of the occasion of regenerating reducing with low power speed.
Below, the 1st example of optical disc apparatus of the present invention and optical disc controller is described.The table motor 402 that optical disc apparatus 101 shown in Figure 1 possesses mounting CD 401 and makes it to rotate, shaven head 403, optical disc process device (hereinafter to be referred as ODC) 150, and drive part 151.
The condenser lens 405 that is installed in the shaven head 403 will drive as the focus direction of the direction vertical with the record surface of CD 401 and the radial direction of CD 401 respectively with tracking driver 407b by focus actuator 407a.Shaven head 403 all can move on the radial direction of CD 401 by horizontal motor 406.
ODC150 comprises DSP112, input 152, period counter 421, V-CLK follower 123 and Abort Timer 122, and system controller 124.Input 152 is made of importation 152a and output 152b.Importation 152a comprises sampling retaining part 409, and selector switch 410 and A/D conversion fraction 411.In addition, output 152b comprises D/A transducer 413,414 and pwm converter 415,416.
Though do not illustrate in Fig. 1, ODC150 can also comprise the regenerated signal binaryzation that will obtain from CD, the circuit of decoding, the circuit that the data that should write down are encoded, and be used for port that exchanges with principal computer resulting signal etc.In addition, the each several part that constitutes ODC150 can be realized by the software that is stored in the storer such as RAM, also can realize that realization also can combine them by the hardware circuit that has used semiconductor technology.In addition, period counter 421 and input 152, system controller 124 can not be included among the ODC150, and are configured as other chip.
As following explaining, DSP112 according to the output of the Abort Timer 122 shown in Fig. 2 (A), carries out following calculation process according to the output clock work of V-CLK follower 123.
At first, DSP112 is since the computing (among the figure, representing with DM) of moment D1 table motor control.Table motor 402 outputs and the corresponding FG signal of swing circle are counted the cycle of this FG signal in period counter 421.Instruction according to system controller 424, DSP112 is to the output of period counter 421 and the difference of table motor rolling target RAM, implement the digital filter computing according to the table motor filter coefficient among the RAM that is set at DSP112 (not shown), and operation result is exported to pwm converter 416 with the timing shown in Fig. 2 (M) as the control signal that is used for driving-disc motor 402.Pwm converter 416 receives control signal, carries out pulse amplitude modulation, and to driving circuit 420 outputs.The signal that driving circuit 420 will receive carries out power amplification, and to horizontal motor 402.Therefore, the number of revolutions of table motor 402 is controlled to become the value of regulation.
At this moment, parallel with above-mentioned processing, A/D transducer 411 like that, is delivered to sample-and-hold circuit 409 with the S/H signal shown in Fig. 2 (B), at the moment S1 FE+ signal and FE-sample of signal is kept.In addition, A/D transducer 411 like that, is sent control signal so that selector switch 410 output FE+ signals at moment S1 shown in Fig. 2 (C).A/D transducer 411 carries out the A/D conversion as Fig. 2 (D), obtain FE+ signal transformation is become the A/D transformed value (FE+ transformed value) of digital signal as Fig. 2 (E).In addition, A/D transducer 411 is sent control signal so that selector switch 410 output FE-signals at moment S2.A/D transducer 411 like that, carries out the A/D conversion shown in Fig. 2 (D), obtain the FE-signal transformation shown in Fig. 2 (F) is become the A/D transformed value (FE-transformed value) of digital signal.
DSP112 is such computing (among the figure, representing with Fc) since moment D2 focus control shown in figure (I).The DSP112 computing to the difference of the FE+ of digital value conversion signal (FE+ transformed value) and FE-signal (FE-transformed value), obtains focus error signal in A/D transducer 411.Instruction according to system controller 424, DSP112 is to focus error signal, implement the digital filter computing according to the focusing filter coefficient among the RAM that is set at DSP112 (not shown), operation result is exported to D/A transducer 413 with the timing shown in Fig. 2 (J) as the control signal of the focusing coil that is used to drive driver 407.D/A transducer 413 becomes the analogue value with the output transform of DSP112, to driving circuit 417 outputs.The control signal of 417 pairs of simulations of driving circuit is carried out power amplification, and arrives the focusing coil of driver 407.Therefore, the convergent point of light beam is controlled to the position on the information recording surface of CD 401.
In addition, the output of photodetector 404 is imported into analog operating unit 408, analog operating unit 408 output TE+ signal and TE-signals.Can access the trail-and-error signal of the offset of expression focus of light beam and track by the difference of getting this TE+ signal and TE-signal.For example obtaining the occasion of trail-and-error signal with the method for recommending, the TE+ signal is the additive signal of the signal that obtains from photodetector 404a and 404c, and the TE-signal is the additive signal of the signal that obtains from photodetector 404b and 404d.
A/D transducer 411 control signal is delivered to sample-and-hold circuit 409 in case at moment S3 to the maintenance of taking a sample of TE+ signal and TE-signal.In addition, A/D transducer 411 transmits control signal so that output TE+ signal at moment S3 to selector switch 410.Like that, A/D transducer 411 carries out the A/D conversion, obtains the A/D transformed value (TE+ transformed value) as the digital signal of TE+ signal shown in Fig. 2 (G).In addition, A/D transducer 411 transmits control signal so that output TE-signal at moment S4 to selector switch 410.Like that, the A/D transducer carries out the A/D conversion, obtains the A/D transformed value (TE-transformed value) as the digital signal of TE-signal shown in Fig. 2 (H).
DSP112 begins the computing (among the figure, representing with Tk) of tracking Control at moment D3.The DSP112 computing to the difference of the TE+ of digital value conversion signal (TE+ transformed value) and TE-signal (TE-transformed value), obtains the trail-and-error signal in A/D transducer 411.Instruction according to system controller, DSP112 implements the digital filter computing to the trail-and-error signal according to the tracking filter coefficient among the RAM that is set at DSP112 (not shown), and operation result is exported to D/A transducer 414 with the timing shown in Fig. 2 (K) as the control signal of the tracking coil that is used to drive driver 407.D/A transducer 414 becomes the analogue value with the output transform of DSP112, to driving circuit 418 outputs.Driving circuit 418 carries out power amplification with the control signal of simulation, and arrives the tracking coil of driver 407.The convergent point of light beam is controlled to the position on the orbit centre of CD 401.
In addition, DSP112 is since the laterally computing (among the figure, representing with TRS) of control of moment D4.Instruction according to system controller 424, DSP112 is to the trail-and-error signal, implement the digital filter computing according to the transversal filter coefficient among the RAM that is set at DSP112 (not shown), and operation result is exported to pwm converter 415 with the timing shown in Fig. 2 (L) as the control signal that is used to drive horizontal motor 406.Pwm converter 415 receives control signal, carries out pulse amplitude modulation, and to driving circuit 419 outputs.The signal that driving circuit 419 will receive carries out power amplification, and to horizontal motor 406.Therefore, shaven head 403 position Be Controlled, and the convergent point position that makes light beam is on the orbit centre of dish 401.
The moment D5 that DSP112 is through with from the computing (TRS) of horizontal control carried out wait work before the output time D6 of next time Abort Timer 422.If the output of Abort Timer 422 is next time arranged, so just carry out above-mentioned servo-controlled program, when the output of each Abort Timer 422, these programs are repeated.
In addition, at this moment, A/D transducer 411, D/A transducer 413,414, pwm converter 415,416, the work clock of period counter 421 is doubly fast as watching regardless of record, regeneration, can be constant, V-CLK follower 123 can be with different to the work clock of DSP112 output.
Below, illustrate about use the characteristic of focusing wave filter, tracking filter, table motor wave filter and transversal filter that Fig. 3 uses in the computing of DSP112.Characteristic in DSP112 on the real time of the digital filter of computing by digital filter coefficient and determined as the frequency of the work clock signal of execution cycle.
When the frequency from the output clock of V-CLK follower 123 is fa, for example sets and focus on wave filter and possess gain characteristic and the phase propetry of representing with the solid line 301,302 of Fig. 3 (a) and Fig. 3 (b).According to signal from system controller 124, become the occasion of the fb lower than fa in frequency from the output clock of V-CLK follower 123, because the frequency as the work clock of benchmark reduces, therefore as with dashed lines 303,304 expressions, the gain characteristic and the phase propetry that focus on wave filter are also moved to the low lateral deviation of frequency.Therefore, even without the value of the digital filter coefficient that changes DSP112, gain characteristic and phase propetry are also moved to the low lateral deviation of frequency as dotting among Fig. 3 (a) and Fig. 3 (b).When low power speed recording, regeneration, in any 1 system of focus servosystem, tracking servo, table motor system and horizontal servo-drive system, because the frequency of external disturbance also reduces, therefore the characteristic of the wave filter that uses in the computing that is used for carrying out these controls also can be the characteristic that is displaced to a low side.
In other words, even it is how identical regardless of record, regeneration times speed to focus on the coefficient of wave filter, tracking filter, table motor wave filter and transversal filter, the frequency incident record of the work clock signal by being imported into DSP112, the regeneration doubly variation of speed change, with the doubly also suitably change of a variation respective filter characteristic of speed of record regenerating.Therefore, do not need to store in advance and the doubly fast corresponding filter coefficient of each record, regeneration, the capacity of storing the storer of these filter coefficients just can solve less.
As above-mentioned, in this example, changed filter characteristic separately by the output clock frequency that changes V-CLK follower 123.But, because the difference of frequency is big between a plurality of clock signals of V-CLK follower 123 outputs, therefore if filter coefficient is become constant, so in the irrealizable occasion of desirable digital filter characteristic, system controller 124 also can be in the output frequency of change V-CLK follower 123, the digital filter coefficient of change DSP112 is realized desirable digital filter characteristic.In this occasion, owing to, therefore also can reduce the power consumption of ODC150 according to the doubly fast change output of record, regeneration clock frequency.
(the 2nd example)
In existing optical disc apparatus shown in Figure 8, in 1 sample period, the total of the operation time that DSP112 should carry out is shorter than 1 sample period.For this reason, in existing optical disc apparatus, like that, after computing finished, DSP112 became waiting status shown in Fig. 9 (i).But in waiting status, the power consumption of DSP112 is also big.In this example, do not carrying out between operational stage, DSP112 will reduce power consumption.
Below, the 2nd example of optical disc apparatus of the present invention and optical disc controller is described.The table motor 402 that optical disc apparatus 102 shown in Figure 4 possesses mounting CD 401 and makes it to rotate, shaven head 403, ODC160, and drive part 151.
ODC160 comprises DSP162, input 152, period counter 421, clock follower 161 and Abort Timer 163, and system controller 124.Input 152 and period counter 421 for example possess the formation identical with the 1st example, and identical such function of bringing into play with the 1st example.
Below, the servocontrol work of optical disc apparatus 102 is described.Fig. 5 represents the control that the ODC160 of optical disc apparatus 102 carries out in 1 sample period.If Abort Timer 163 outputs to DSP162 and clock follower 161 with look-at-me, DSP162 will recover from sleep state so, since the computing of moment D1 table motor control.
The computing of the table motor control that DSP162 carries out from moment D1, the computing of the focus control of carrying out from moment D2, the concrete program of the computing of the computing of the tracking Control of carrying out from moment D3 and the horizontal control carried out from moment D4 is identical with the 1st example.
If DSP162 finishes the laterally computing (TRS) of control.At moment D5, operation result is exported to pwm converter 416 so.In addition, DSP162 exports the computing end signal to clock follower 161.
If clock follower 161 receives the computing end signal, just stop the generation of clock signal.Therefore, DSP162 quits work, and enters sleep state.Under sleep state, DSP162 quits work, the power consumption vanishing of DSP162 or be roughly zero.At this moment, input 152 and drive part 151 work on respectively.
If Abort Timer 163 is to DSP162 and the next look-at-me of clock follower 161 outputs, clock follower 161 is again to the DSP162 clock signal so.Therefore, DSP162 recovers from sleep state, starts working once more.
If according to this example, carrying out between operational stage so, DSP162 will quit work.Therefore, power consumption in the meantime can be reduced, and the power consumption of ODC160 can be reduced.
In above-mentioned example, shift to sleep state the computing that DSP162 carries out the 1 sample period planted agent back that is all over, but also can accomplish between computing in 1 sample period and the computing sleep state to be set.For this reason, for example as shown in Figure 4, in A/D transducer 411, generate the A/D conversion end signal that expression A/D conversion finishes, and to 161 outputs of clock follower.Perhaps, signal from A/D transducer 411 when DSP162 is output, A/D conversion end signal can generate before several clocks that the A/D conversion finishes so that make DSP162 work.
Specifically, as shown in Figure 6, after the computing (DM) of table motor control finishes, at moment D2, DSP162 will export to pwm converter 416 as the control signal of operation result.At this moment, DSP162 exports the computing end signal to clock follower 161.Clock follower 161 is according to the computing end signal, the output of interrupt clock signal.Therefore, DSP162 becomes sleep state S1.At this moment, input 150 and is carried out the A/D conversion with the FE-signal just in the course of the work.When A/D transducer 411 finishes in the A/D conversion, A/D conversion end signal is exported to clock follower 161.Therefore, the output of clock follower 161 beginning clock signals, DSP162 recovers from sleep state according to the clock signal that has received.
In addition, after the computing (Fc) of focus control finishes, at moment D3, DSP162 will export to D/A transducer 413 as the focus control signal of operation result.At this moment, DSP162 exports the computing end signal to clock follower 161.Clock follower 161 is according to the output of computing end signal interrupt clock signal.Therefore, DSP162 becomes sleep state.At this moment, input 150 is carried out the A/D conversion to the TE-signal just in the course of the work.When A/D transducer 411 finishes in the A/D conversion, to clock follower 161 output A/D conversion end signals.Therefore, the output of clock follower 161 beginning clock signals, DSP162 recovers from sleep state according to the clock signal that has received.
If laterally the computing of motor control finishes, so as described above, according to the computing end signal, clock follower 161 stops the output of clock signal, and DSP162 becomes sleep state, and recovers by the output of Abort Timer 163.
Except that above-mentioned example, can carry out during dormant by specifying in advance from the dormant recovery of DSP162.For example, can accomplish the computing end signal according to DSP162, clock follower 161 stops clock signal output, and clock follower 161 begins the output of clock signal again through behind the official hour.
In addition, in the above description, illustrated that optical disc apparatus 102 writes down data or the servo action of the normal condition of regenerating in CD.Optical disc apparatus 102 can make maximum time become sleep state in 1 sample period when normal condition.For this reason, by the action of sleeping, can make power consumption drop to minimum.But, except that normal condition, for example be used in the study processing of the parameter of CD identifying recording layer and the occasion of retrieval process setting, DSP162 also can with do not carry out computing during become sleep state.In the occasion of carrying out such processing, become sleep state by making DSP162, also can further reduce power consumption.
(the 3rd example)
In this example, illustrate when when exploitation and the repairing behind product export, can observe the optical disc apparatus of control signal etc. easily.
Below, the 3rd example of optical disc apparatus of the present invention and optical disc controller is described.The table motor 402 that optical disc apparatus 103 shown in Figure 7 possesses mounting CD 401 and makes it to rotate, shaven head 403, ODC170, and drive part 151.
ODC170 comprises DSP112, input and output 171, and period counter 421, follower 172 all the time, Abort Timer 122, and system controller 124.DSP112, period counter 421, Abort Timer 122 and system controller 124 be identical with the 1st example to carry out work.Clock follower 172 makes the fixed-frequency of clock signal.
The ODC170 basis is given the instruction with system controller 124, can be with focus control signal or the tracking control signal of in the DSP112 of ODC170, obtaining, perhaps, from 411 inputs of A/D transducer, carry out the D/A conversion by focus error signal or trail-and-error signal before the DSP112 execution calculation process, and can be from monitor lead-out terminal 174 output simulating signals.
If according to optical disc apparatus 103, do not need special-purpose anchor clamps so and directly connect oscillographs 427 by monitor lead-out terminal 174 with D/A transducer 125, just can observe focus error signal or trail-and-error signal.For this reason, can make development efficiencyization, and when the repairing of optical disc apparatus 103, can shorten servicing time.
In addition, in above-mentioned the 2nd example, the clock signal of clock follower output constant frequency, but as having illustrated in the 1st example can adopt the V-CLK follower that has illustrated in the 1st example in the optical disc apparatus of the 2nd example or ODC.In addition, also can in the optical disc apparatus of the 1st example or the 2nd example or ODC, be arranged on D/A transducer 125 and the monitor lead-out terminal 174 that has illustrated in the 3rd example.
If according to the present invention, low ODC of power consumption and the optical disc apparatus that has loaded ODC will be realized.For this reason, can possess notebook-sized personal computer and PDA, game machine adopts the present invention suitably in the portable electric appts of optical disc apparatus such as portable phonograph, and the electric battery duration of these portable electric appts is prolonged.
In addition, if according to the present invention, just can be easy to optical disc apparatus or the equipment that possesses optical disc apparatus are carried out maintenance and repair.
Claims (7)
1, a kind of optical disc controller, be used for the servocontrol optical disc apparatus, described optical disc apparatus has: be used for making the table motor of CD rotation and penetrate being used for it is characterized in that at the CD record data and/or from the shaven head of the light beam of CD playback of data described optical disc controller possesses:
The V-CLK output, a plurality of clock signals that output frequency is different; With
Control section for the light beam of the described optical disc apparatus of servocontrol, by receiving the signal of expression from the departure of the desired value of regulation from described shaven head, carries out computing according to the signal of representing described departure, obtains the signal and the output of expression controlled quentity controlled variable;
Record speed multiplay when carrying out operation of recording and/or regenerating action according to described optical disc apparatus and/or regeneration is speed doubly, described V-CLK output changes the frequency of described clock signal, and described control section is synchronized with the clock signal of described V-CLK output and carries out computing.
2, optical disc controller according to claim 1 is characterized in that,
Described computing is implemented by the mode that the signal process that makes the described departure of expression has the wave filter of predetermined characteristic, and the characteristic of described wave filter is doubly fast and different according to described record speed multiplay and/or regeneration.
3, optical disc controller according to claim 2 is characterized in that,
The characteristic of described wave filter is by the decision of the frequency of filter coefficient and described clock signal, no matter described record speed multiplay and/or regeneration times speed are how, described filter coefficient is all identical.
4, a kind of optical disc apparatus possesses:
Conversion fraction at the CD with the track that is used for record data, will be transformed into electric signal with light beam irradiates from the reflected light of described CD reflection or the transmitted light that passes described CD;
Focus actuator moves the focus of described light beam in the direction vertical with described optical disc data face;
Follow the tracks of driver, described light beam is moved to the radial direction of described CD;
Control section, carry out computing according to described electric signal, the control focus actuator makes the converged state of described light beam in described data surface maintenance regulation, generates the control signal that is used for controlling according to the mode that makes described light beam be positioned at the center of described track described tracking driver; With
The V-CLK output, a plurality of clock signals that output frequency is different;
Record speed multiplay when carrying out operation of recording and/or regenerating action according to described conversion fraction and/or regeneration is speed doubly, described V-CLK output changes the frequency of described clock signal, and described control section is synchronized with the clock signal of described V-CLK output and carries out computing.
5, optical disc apparatus according to claim 4 is characterized in that,
Also possess input, receive described electric signal, be transformed into after the digital signal to described control section output, and, receive control signal from described control section, be transformed into after the simulating signal to described focus actuator and follow the tracks of driver output;
The work clock of described input is no matter how all constant described record speed multiplay and/or regeneration times speed is.
6, optical disc apparatus according to claim 4 is characterized in that,
Described control section generates described control signal by the wave filter that makes described electric signal process have the characteristic of regulation, and the characteristic of described wave filter is doubly fast and different according to described record speed multiplay and/or regeneration.
7, optical disc apparatus according to claim 6 is characterized in that,
The characteristic of described wave filter is by the decision of the frequency of filter coefficient and clock signal, no matter described record speed multiplay and/or regeneration times speed are how, described filter coefficient is all identical.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002308232 | 2002-10-23 | ||
| JP2002308232 | 2002-10-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2003101025525A Division CN1303589C (en) | 2002-10-23 | 2003-10-23 | Optical disk controller and optical disk device |
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| CN101013572A true CN101013572A (en) | 2007-08-08 |
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| CNB2003101025525A Expired - Fee Related CN1303589C (en) | 2002-10-23 | 2003-10-23 | Optical disk controller and optical disk device |
| CNA2007100020359A Pending CN101013572A (en) | 2002-10-23 | 2003-10-23 | Optical disk controller and optical disk device |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2003101025525A Expired - Fee Related CN1303589C (en) | 2002-10-23 | 2003-10-23 | Optical disk controller and optical disk device |
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| Country | Link |
|---|---|
| US (1) | US7496006B2 (en) |
| KR (1) | KR101009770B1 (en) |
| CN (2) | CN1303589C (en) |
| TW (1) | TWI308324B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7583569B2 (en) * | 2004-07-08 | 2009-09-01 | Realtek Semiconductor Corp. | Apparatus and related method for generating a tracking error signal in an optical disc drive |
| US7633842B2 (en) * | 2004-07-08 | 2009-12-15 | Realtek Semiconductor Corp. | Apparatus for generating tracking error signal in optical disc drive |
| TWI258740B (en) * | 2004-07-08 | 2006-07-21 | Realtek Semiconductor Corp | Apparatus and method for generating a tracking error signal in an optical disc drive |
| US7512043B2 (en) * | 2004-07-08 | 2009-03-31 | Realtek Semiconductor Corp. | Apparatus and method for generating a tracking error signal in an optical disc drive |
| JP4596284B2 (en) * | 2008-05-26 | 2010-12-08 | ソニー株式会社 | Optical disc apparatus and focus control method |
| KR101607856B1 (en) * | 2010-01-04 | 2016-04-11 | 삼성전자 주식회사 | Optical disc playback device and control method thereof |
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| JPS58189842A (en) * | 1982-04-30 | 1983-11-05 | Toshiba Corp | Optical digital disc player |
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| JPH032064A (en) * | 1989-05-31 | 1991-01-08 | Canon Inc | Printer |
| JPH0380437A (en) | 1989-08-23 | 1991-04-05 | Nec Corp | Digital controlling system |
| JP2993052B2 (en) * | 1990-05-30 | 1999-12-20 | ソニー株式会社 | Disk drive device |
| JP3395192B2 (en) * | 1991-05-25 | 2003-04-07 | ソニー株式会社 | Digital audio signal reproduction device, reproduction pause circuit of disk player, and reproduction control circuit of disk reproduction device |
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| JPH08329506A (en) | 1995-06-02 | 1996-12-13 | Matsushita Electric Ind Co Ltd | Optical disk servo device |
| US6009056A (en) * | 1996-01-16 | 1999-12-28 | Matsushita Electric Industrial Co., Ltd. | Optical disc data reproducing method and optical disk driver |
| US6249495B1 (en) * | 1997-02-27 | 2001-06-19 | Matsushita Electric Industrial Co., Ltd. | Stepping motor control method and disk drive apparatus |
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2003
- 2003-10-22 TW TW092129307A patent/TWI308324B/en not_active IP Right Cessation
- 2003-10-23 CN CNB2003101025525A patent/CN1303589C/en not_active Expired - Fee Related
- 2003-10-23 KR KR1020030074041A patent/KR101009770B1/en not_active IP Right Cessation
- 2003-10-23 CN CNA2007100020359A patent/CN101013572A/en active Pending
- 2003-10-23 US US10/691,848 patent/US7496006B2/en not_active Expired - Fee Related
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| KR101009770B1 (en) | 2011-01-19 |
| US20040081040A1 (en) | 2004-04-29 |
| CN1303589C (en) | 2007-03-07 |
| TWI308324B (en) | 2009-04-01 |
| KR20040036600A (en) | 2004-04-30 |
| US7496006B2 (en) | 2009-02-24 |
| TW200416692A (en) | 2004-09-01 |
| CN1497545A (en) | 2004-05-19 |
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